I also carry my bikes over the bed of the truck:
All of the bike rack gear was left over from past applications, so nothing to buy other than some metal pieces to attach the rack system to my TrackRac rails. I also have a TracRac tonneau cover, which I can roll up all of the way if I need to get in the truck bed.
I don't think my rack system is gonna work when I get a 5th wheel.
Chap , DW Joy, and Fur Baby Sango
2006 Ford F150 Super Cab 4x4
2008 Surveyor 263